GUI: Rethink layout/contents of SubframeExperiment
SubframeExperiment
currently contains some important information about the instrument, but displays it in an unintuitive way that makes poor use of the available space. We need to decide what the purpose of this widget is, and how to better display its contents.
Additionally, the code is written in a way that is inconsistent with the rest of the subframes, with several widget unnecessarily in different files. This should be refactored.